The java.lang.StringBuffer class is a thread-safe, mutable sequence of characters. Following are the important points about StringBuffer −A string buffer is like a String but can be modified.It contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls.They are ... Read More

Following is a Java example which deletes duplicate elements from a given string.Exampleimport java.util.Arrays; import org.apache.commons.lang3.ArrayUtils; public class DuplicateSample {    public static void main(String args[]){       String str = "malayalam";       char[] myArray = str.toCharArray();       for(int i=0; i

StringBuffer provides a method with name reverse() one way to check for a palindrome isCreate a StringBuffer object by passing the required string as a parameter to the constructor.Reverse the contents of the object using the reverse() method.Convert the StringBuffer object to Sting using the toString() method.Now, compare the String and the ... Read More

You can check the equality of two Strings in Java using the equals() method. This method compares this string to the specified object. The result is true if and only if the argument is not null and is a String object that represents the same sequence of characters as this ... Read More

You can concatenate strings using the ‘+’ operator of Java.ExampleLive Demopublic class Test {    public static void main(String args[]){       String st1 = "Hello";       String st2 = "How";       String st3 = "You";       String res = st1+st2+st3;       System.out.println(res);    } }OutputHelloHowYou

If you try to concatenate strings using concat() method, you can concat variables of string data type only.To concatenate strings with other data type you need to use the ‘+’ operator.Examplepublic class Test {    public static void main(String args[]){       String st1 = "Hello";       ... Read More

You can concatenate two strings in Java either by using the concat() method or by using the ‘+’ , the “concatenation” operator.The concat() methodThe concat() method appends one String to the end of another. This method returns a String with the value of the String passed into the method, appended ... Read More

Since String class is immutable once created we cannot modify the data of the string. But still, if you want to manipulate string data you can rely on StringBuffer or StringBuilder classes.Examplepublic class Test {    public static void main(String args[]) {       String str = "Hi welcome ... Read More

JRE is Java Runtime Environment and is the machine-specific implementation of JVM. It contains libraries like rt.jar, class loaders etc which are used by JVM.

Java memory model is divided between Thread Stacks (One for each thread) and a heap area.Thread StackIt is a thread specific memory area and contains local variables, methods call information etc. JVM stacks could be of fixed size or variable size. If computation in a thread exceeds its stack size ... Read More